ML21309A000
| ML21309A000 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 11/29/2021 |
| From: | John Lamb Plant Licensing Branch II |
| To: | Gayheart C Southern Nuclear Operating Co |
| Lamb J | |
| References | |
| EPID L-2021-LLA-0199 | |
| Download: ML21309A000 (8) | |
Text
November 29, 2021
Ms. Cheryl A. Gayheart Regulatory Affairs Director Southern Nuclear Operating Co., Inc.
3535 Colonnade Parkway Birmingham, AL 35243
SUBJECT:
EDWIN I. HATCH NUCLEAR PLANT, UNITS 1 AND 2 - REGULATO RY AUDIT IN SUPPORT OF REVIEW O F THE APPLICATION TO ADOPT RISK-INFORMED EXTENDED COMPLETION TIMES - RITSTF INITIATIVE 4B (EPID L-2021-LLA-0199)
Dear Ms. Gayheart:
By letter dated October 26, 2021, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21300A153), Southern Nuclear Operating Company (SNC, the licensee) submitted a license amendment request (LAR) for Edwin I. Hatch Nuclear Plant (Hatch), Units 1 and 2. The proposed LAR would modify the plan ts Technical Specification requirements to permit the use of risk-informed completion time s in accordance with Technical Specification Task Force Traveler TSTF 505, Provide Risk-infor med Extended Completion Times, RITSTF [Risk-Informed Technical Specification Task Force ] Initiative 4b.
The U.S. Nuclear Regulatory Commission (NRC) staff has identifi ed the need for a regulatory audit to examine the SNCs non-docketed information with the in tent to gain understanding, to verify information, or to identify information that will requir e docketing to support the basis of the licensing or regulatory decision.
The NRC staff will conduct the audit virtually via Teams using a licensee-established electronic portal available to NRC staff from approximately December 13, 2 021, through June 30, 2022, with formal audit meetings to be scheduled during this period a s needed. The detailed audit plan is enclosed with this letter.
C. Gayheart
If you have any questions, please contact me at (301) 415-3100 or by e-mail at John.Lamb@nrc.gov.
Sincerely,
/RA/
John G. Lamb, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
Docket Nos. 50-321 and 50-366
Enclosure:
Audit Plan
cc: Listserv REGULATORY AUDIT PLAN
BY THE OFFICE OF NUCLEAR REACTOR REGULATION
TO SUPPORT THE REVIEW OF THE LICENSE AMENDMENT REQUEST
TO ADOPT RISK-INFORMED COMPLETION TIMES
SOUTHERN NUCLEAR OPERATING COMPANY
EDWIN I. HATCH NUCLEAR PLANT, UNITS 1 AND 2
DOCKET NOS. 50-321 AND 50-366
1.0 BACKGROUND
By letter dated October 26, 2021 (Reference 1), Southern Nuclea r Operating Company (SNC, the licensee) submitted a license amendment request (LAR) to am end Renewed Operating License Nos. DPR-57 and NPF-5 for the Edwin I. Hatch Nuclear Pl ant (Hatch), Units 1 and 2, respectively. The proposed LAR would modify the plants Techni cal Specification (TS) requirements to permit the use of risk-informed completion time s (RICTs) in accordance with Technical Specification Task Force (TSTF) Traveler TSTF-505, P rovide Risk-informed Extended Completion Times, RITSTF [Risk-Informed Technical Spec ification Task Force]
Initiative 4b (Reference 2). These RICTs would apply to certa in actions required when limiting conditions for operation are not met.
The staff from the Nuclear Regulatory Commissions (NRC) Office of Nuclear Reactor Regulation (NRR) has initiated it s review of the LAR in accordance with NRR Office Instruction LIC-101, License Amendment Review Procedures (Reference 3).
2.0 REGULATORY AUDIT BASIS
A regulatory audit is a planned license-or regulation-related activity that includes the examination and evaluation of primarily non-docketed informatio n associated with the LAR. An audit is conducted to gain understanding, to verify information, and to identify information that will require docketing to support the basis of a licensing or r egulatory decision. An audit will assist the NRC staff in efficiently conducting its review and g aining insights to the licensees processes and procedures. Information that the NRC staff relie s upon to make the safety determination must be submitted on the docket. This audit will be conducted in accordance with NRR Office Instruction LIC-111, Regulatory Audits, Revision 1, dated October 2019 (Reference 4), with exceptions noted within this audit plan.
The NRC staff will perform the audit to support its evaluation of whether SNCs LAR can be approved per Title 10 of the Code of Federal Regulations (10 CFR), Section 50.90, Application for amendment of license, construction permit, or early site pe rmit. The NRC staffs review will be informed by NUREG-0800, Standard Review Plan Section 19.2, Review of Risk Information Used to Support Permanent Plant-Specific Changes to the Licensi ng Basis (Reference 5). The audit will assist the NRC staff with understanding the licensee s proposed program to implement RICTs for certain TSs.
Enclosure
3.0 REGULATORY AUDIT SCOPE AND METHODOLOGY
NRCs objectives of the audit are the following:
Learn how the licensees proposed program implements TSTF-505 and conforms to NRC-endorsed guidance in Nuclear Energy Institute (NEI) report NEI 06-09, Revision 0-A, Risk-Informed Technical Specification Initiative 4b, Risk-Managed Technical Specification Guidelines (Reference 6).
Gain a better understanding of the detailed calculations, anal yses, and bases underlying the LAR and confirm the NRC staffs understanding of the LAR.
Gain a better understanding of plant design features and their implications for the LAR.
Identify any information needed to enable the staffs evaluati on of the technical acceptability of the probabilistic risk assessment (PRA) used f or this application.
Identify any information needed to enable the NRC staffs eval uation of whether the proposed changes challenge design-basis functions or adversely affect the capability or capacity of plant equipment to perform design-basis functions.
Identify questions and requests that may become formal request s for additional information (RAIs) per NRR Office Instruction LIC-115, Process ing Requests for Additional Information (Reference 7).
The NRC staff will audit the PRA methods that the licensee woul d use to determine the risk impact from which the revised completion times would be obtaine d, including the licensees assessments of internal events (including internal flooding), f ire, and seismic PRAs. The NRC will also audit the licensees assessment of risk from other ex ternal events, and the licensees evaluation of defense-in-depth.
4.0 INFORMATION AND OTHER MATERIAL NECESSARY FOR THE AUDIT
The NRC staff will request information and an audit meeting(s) throughout the audit period. The NRC staff will use an audit items list to identify the inform ation (e.g., methodology, process information, and calculations) to be audited. The NRC staff will provide the final audit items list as an enclosure to the audit summary report, which will be publ icly available. The attachment to this audit plan includes the initial audit items list. Through out the audit period, the NRC staff will provide SNC with audit questions and audit-related requests so that the licensee can better prepare for audit discussions with NRC staff. Any information accessed through the licensees portal will not be held or retained in any way by NRC staff. T he NRC staff requests the licensee to have the requested audit information listed in the audit ite ms list to be readily available and accessible for the NRC staffs review via a Web-based portal.
5.0 TEAM ASSIGNMENTS
The audit team will consist of the following NRC staff from NRR and contractors.
Dawnmathews Kalathiveettil, Plant Licensing Branch 2-1 (LPL2-1 )
John G. Lamb, LPL2-1 Ed Miller, LPL2-1 Adrienne Driver, PRA Licensing Branch A (APLA)
Joshua Havertape, APLA Bernard Grenier, PRA Licensing Branch B (APLB)
Sunwoo Park, PRA Licensing Branch C (APLC)
Keith Tetter, APLC Andrea Russell, Technical Specifications Branch (STSB)
Brian Lee, Containment and Plant Systems Branch (SCPB)
Norbert Carte, Instrumentation and Controls Branch B (EICB)
Joseph Ashcraft, EICB Nadim Khan, Electrical Engineering Branch (EEEB)
Steve Wyman, EEEB Chris Jackson, Nuclear Systems Performance Branch (SNSB)
Mark Wilk, Pacific Northwest National Laboratory (PNNL)
Steve Short, PNNL
6.0 LOGISTICS
To support the review schedule communicated to SNC when the NRC staff accepted the LAR for technical review, audit activities will be performed remote ly and virtually using Microsoft Teams, teleconference, and a Web-based portal or other virtual meeting space created by the licensee. NRC information requests and communications with lic ensee staff will be coordinated through the NRCs licensing project manager.
A desktop audit will take place between December 13, 2021, and June 30, 2022. The NRCs entrance meeting with the licensee will be on December 13, 2021. The NRCs licensing project manager will inform the licensee of the entrance and exit meeti ng dates when they are established. The NRC intends to establish a three-day virtual audit meeting via Microsoft Teams on mutually agreeable dates and times, tentatively schedu led for the week of April 4, 2022, to discuss information needs and questions arising from t he NRCs review of the audited items. The NRC staff may change and/or add audit dates and tim es when deemed necessary.
Audit meeting agenda and questions will be sent in advance of t he audit meeting.
The NRC staff requests the licensee to have the information ref erenced in Section 4.0 of this audit plan available and accessible for the NRC staffs review via an internet-based portal within 6 weeks of the date of this audit plan. The NRC staff r equests that any supplemental information requested be available and accessible for the NRC s taffs review within 1 week of the date of the NRCs notification to the licensee of the new requests. The NRCs licensing project manager will inform the licensee via routine communicat ions when the NRC staff no longer needs access to the portal. The NRC staff requests the licensee to notify the review team when an audit item is added to its portal by sending an e-mail to the NRC licensing project manager or to the review team email address (HatchTSTF-505@usnr c.onmicrosoft.com).
7.0 SPECIAL REQUESTS
The NRC requests access to requested documents and information through a Web-based portal that allows the NRC staff and contractors to access documents o ver the Internet. The following conditions associated with the online portal must be maintained while the NRC staff and contractors have access to the online portal:
The online portal will be password-protected. A separate pass word will be assigned to each member of the NRC staff and NRC contractors participating in the audit.
The online portal will prevent the NRC participants from print ing, saving, downloading, or collecting any information directly from the online portal.
Conditions of use of the online portal will be displayed on th e login screen and will require acknowledgment by each user.
Username and password and/or other Web-based portal access info rmation should be provided directly to members of the NRC staff and contractors as needed. The NRC licensing project manager will provide the licensee with names and contact inform ation of the NRC staff and contractors participating in the audit. All other communicatio ns should be coordinated through the NRC project manager.
8.0 DELIVERABLES
The NRC staff will develop any RAIs, as needed, via NRR Office Instruction LIC-115 and issue such RAIs separately from audit-related correspondence. The NR C staff will issue an audit summary report prior to completing its review of the LAR.
9.0 REFERENCES
1 Southern Nuclear Operating Company letter to U.S. Nuclear Reg ulatory Commission (NRC),
"Edwin I. Hatch Nuclear Plant, Units 1 and 2, License Amendment Request to Revise Technical Specifications to Adopt Risk Informed Completion Time s TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initia tive 4b," October 26, 2021 (ADAMS Accession No. ML21300A153).
2 Technical Specifications Task Force (A Joint Owners Group Act ivity); Pressurized Water Reactors Owners Group (PWROG); Boiling Water Reactors Owners Gr oup (BWROG) and Advanced Passive Owners Group (APOG), "letter to U.S. Nuclear R egulatory Commission (NRC) - TSTF Comments on Draft Safety Evaluation for Traveler [ Technical Specification Task Force] TSTF-505, "Provide Risk-Informed Extended Completio n Times," and Submittal of TSTF-505, Revision 2," July 2, 2018 (ADAMS Accession No. ML1 8183A493).
3 U. S. Nuclear Regulatory Commission (NRC), NRR Office Instruc tion, "LIC-101, Revision 6 -
License Amendment Review Procedures," August 3, 2020 (ADAMS Acc ession No.
4 U. S. Nuclear Regulatory Commission (NRC), NRR Office Instruc tion, "LIC-111, Revision 1 -
Regulatory Audits," October 31, 2019 (ADAMS Accession No. ML192 26A274).
5 U.S. Nuclear Regulatory Commission (NRC), "NUREG-0800, Standa rd Review Plan, Chapter 19.2 - Review of Risk Information to Support Permanent Plant - Specific Changes to the Licensing Basis: General Guidance," June 2007 (ADAMS Access ion No. ML071700658).
6 Nuclear Energy Institute (NEI), "NEI 06-09 (Revison 0) - A: R isk-Informed Technical Specifications Initiative 4b, Risk-Managed Technical Specificat ions (RMTS) Guidelines, Industry Guidance Document," November 2006 (ADAMS Accession No. ML12286A322).
7 U.S. Nuclear Regulatory Commission (NRC), NRR Office Instruct ion, "LIC-115, Revision 1 -
Processing Requests for Additional Information," August 9, 2021 (ADAMS Accession No. ML21141A238).
Initial Audit Items List
Item # Audit Item 1 Reports of full-scope and focused-scope peer reviews, facts a nd observations (F&Os) closure reviews, and any self-assessments referred to in license amendment request (LAR) Enclosure 2 for the internal events, in ternal flooding, fire, and seismic probabilistic risk assessments (PRAs) cited i n the LAR.
2 For the internal events, internal flooding, fire, and seismic PRAs, plant-specific documentation (e.g., uncertainty notebooks) related to:
- a. The review of the PRA model assumptions and sources of uncer tainty (generic and plant-specific assumptions/uncertainties).
- b. Identification of key assumptions and sources of uncertainty for this LAR.
- c. Parametric uncertainty and state-of-knowledge correlation evaluation.
3 PRA notebooks for the modeling of FLEX equipment and FLEX hum an error probabilities credited in the PRAs.
4 PRA notebook(s) for the Reactor Protection System.
5 Documentation of how shared or cross-tied systems are modeled in the PRA.
6 Hatch fire PRA notebooks containing the results of the fire P RA.
7 If available, the primary document(s) supporting the revised Hatch Units 1 and 2 warning time analysis to reconfirm that the external flooding h azard can be screened out using screening criterion C5 (or using the criteri a of Section 6-2-3 of ASME/ANS RA-Sa-2009 if external flooding cannot be screened as a slow-moving event).
8 If modeled, the PRA notebooks associated with the modeling of Open Phase Condition (OPC) in electrical switchyards and the Open Phase Is olation System (OPIS).
9 Documentation supporting the development of the real-time ris k tool and benchmarking it against the PRA.
10 Documentation supporting the example risk informed completio n times (RICT) calculations presented in LAR Enclosure 1, Tables E1-2 and E1-3.
11 Plant and PRA configuration control procedures.
12 Any draft or final RICT program procedures (e.g., for risk m anagement actions, PRA functionality determination, and recording limiting conditi ons for operation).
13 Plant procedures related to risk management actions for the electrical power systems, if available.
14 Relevant design documentation (e.g., single line diagrams of the electrical power distribution systems and piping and instrumentation diagrams).
15 Design details of systems shared or cross-tied between Units 1 and 2, including electrical and mechanical systems.
16 Other documentation that the licensee determines to be respo nsive to the NRC staff's information requests.
Attachment
ML21309A000 OFFICE NRR/DORL/LPLII-2/PM NRR/DORL/LPLII-2/LA NRR/DRA/APLA/BC NRR/DRA/APLB/BC NAME DKalathiveettil KGoldstein ABrown for RPascarelli JWhitman DATE 11/22/2021 11/05/2021 11/23/2021 11/23/2021 OFFICE NRR/DRA/APLC NRR/DEX/EICB/BC NRR/DEX/EEEB/BC NRR/DSS/SNSB/BC NAME SRosenberg RStattel for MWaters WMorton SKrepel DATE 11/23/2021 11/23/2021 11/23/2021 11/17/2021 OFFICE NRR/DSS/SCPB/BC(A) NRR/DSS/STSB/BC NRR/DORL/LPLII-2/BC NRR/DORL/LPLII-2/PM NAME SJones NJordan MMarkley JLamb DATE 11/22/2021 11/17/2021 11/29/2021 11/29/2021